Fix #3023: Improve error message for invalid Font Awesome icons#3037
Merged
ehuss merged 1 commit intorust-lang:masterfrom Feb 27, 2026
Merged
Fix #3023: Improve error message for invalid Font Awesome icons#3037ehuss merged 1 commit intorust-lang:masterfrom
ehuss merged 1 commit intorust-lang:masterfrom
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When an invalid Font Awesome icon name is used (e.g. in git-repository-icon),
the error message now includes the icon name, the type that was searched,
valid prefix options (fas/fab/far), and a link to the FontAwesome icon gallery.
Before: Missing font github
After: Unknown Font Awesome icon `github` for type `regular`. Hint: check
the icon name and prefix (fas (solid), fab (brands), or far (regular))
at https://fontawesome.com/v6/search?m=free
Fixes rust-lang#3023
ehuss
approved these changes
Feb 27, 2026
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Problem
When an invalid Font Awesome icon name is used in
book.toml(e.g.git-repository-icon = "fa-github"), the error message is cryptic:This leaves users confused about what went wrong and how to fix it, especially since
fa-githubwas suggested by older documentation.Fix
Improved the error message in the
fa_helperhandlebars helper to include:After:
Test
Added
fontawesome_error_messageintegration test that:git-repository-icon = "fa-github"(a common mistake — should befab-github)[..]wildcards for line/col numbers so the test is stable across template changesFull test suite passes on macOS ARM (Apple Silicon): 251 passed, 0 failed.
Fixes #3023